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It is the state of overthinking for a period of time, leading your mind to wander, spaces out, or completely float away from reality. It is the exact feeling of being physically present but mentally detached because your brain is stuck in a loop of deep thoughts.

Origin/Etymology: Derived from the colloquial Filipino phrases "Lutang ka teh?" (Your brain is floating, girl?) and "Lumilipad na naman ang utak mo" (Your mind/brain is flying again). It blends the heavy weight of overthinking with the floating sensation of being completely spaced out.
"Sorry, what did you say? I was seilusing for a minute there."

"Lately, I catch myself seilusing every late night thinking about the future."
Seilus by Catheryn may June 11, 2026
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A derivitive from seclusion.

N: 1. A small room, a hole, a corner. 2. a place were no many wander yander.
1. Putting an agitated person in a secluse free of stimulation may help them chill the fuck out.

2. He is hidden away all day up in his secluse.

3. Sometimes I wish we could lock the drunker roomate in a secluse so he never gets out.
Secluse by DUSTBURRY March 29, 2011
Related Words
(Seiklus is Estonian for 'adventure'.)

Seiklus is one of the most famous games made with Game Maker. It was created by cly5m. Seiklus is a fascinating puzzle/platformer.
If you haven't heard of Seiklus you can't call yourself a gamer.
Seiklus by jimmybone d April 24, 2008

silussyromantic 

The term describes romantic attraction
towards silas the pussy. There can be
much to little sexual tension. In fact, it
does not matter what sexuality the
person has to be attracted to the naughty
boy at all.
I identify as silussyromantic

Sexiluscious 

A combination of sexy,lusious,and delicious.
That chick was sexiluscious
Sexiluscious by Romopromosalad March 10, 2010
Gorgeous, Amazing, one of the coolest person every,. word cant explain her she's just amazing
Seilosa is amazing!
Seilosa by 121510 December 16, 2010
1. Is a hardcore punk/metal lover. Usually has a shaved head and wears black. Is also commonly a spelling/grammar nazi.
Silus: *headbangs*
Silus by Nerd360 September 28, 2011